Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh sai » hanh san, hanh tai, danh sai
toc sach » hoc sach, doc sach, thuoc sach
dua tren » dung tren
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
dau loc » hau loc, dau ngoc, dau nuoc
va hanh » van hanh, va thanh, va danh
ve dau » va dau, ve du, ke dau
loc va » hoc va, luc va
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: ((thu sach) or (toc sach)) ky lang xa hoi. hieu ve dau loc va hanh sai ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (toc sach)) ky lang xa hoi. hieu ve dau loc va hanh sai ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (toc sach)) ky lang xa hoi. hieu ve dau loc va hanh sai ((dua tren) or (cua te))*.