Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hang dau » hang va, hang tai
van hang » van khang, van hoang, van thang
cham tuc » nham thuc, pham thuc, tham thuc
cua viet » ca viet, hoa viet, cua vat
hoc sach » hoc sinh, hoc cac, hoc anh
nang mai » nang ma, nang tai, lang mai
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
tuc van » thuc van, truc van, tuc va
ve cham » va cham, ve chat, vu cham
y nang » ky nang, ly nang, v nang
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) OR (hoc sach)) y nang mai hoi. hieu ve cham tuc van hang dau ((cua te) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) y nang mai hoi. hieu ve cham tuc van hang dau ((cua te) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) y nang mai hoi. hieu ve cham tuc van hang dau ((cua te) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) y nang mai hoi. hieu ve cham tuc van hang dau ((cua te) or (cua viet))*.