Perhaps you should try some spelling variations:
trinh vat » trinh van, trinh luat, sinh vat
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
tinh va » tich va, trinh van, tinh gia
coc tuc » coc luc, hoc thuc, doc thuc
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ky lang » ky nang, ky dang, ky tang
tuc va » thuc va, truc va, tuc xa
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky lang xa hoi. ((hieu ve) or (lieu va)) coc tuc va ((tinh va) OR (trinh vat)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. ((hieu ve) OR (lieu va)) coc tuc va ((tinh va) OR (trinh vat)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. ((hieu ve) or (lieu va)) coc tuc va ((tinh va) OR (trinh vat)) cua tu".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. ((hieu ve) or (lieu va)) coc tuc va ((tinh va) OR (trinh vat)) cua tu*.