Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hanh cat » hanh cac, hanh luat, nhanh cay
hanh ca » hanh cac, hanh cua, hanh cad
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
qua cac » cua cac
ty nang » ky nang, ty xang, ty hang
cac tuc » cac toc, cac tu, cac tac
tuc va » thuc va, truc va, tuc xa
ma hoi » mai hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty nang ((ma hoi) OR (xa hoi)). hieu qua cac tuc va ((hanh ca) or (hanh cat)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((ma hoi) OR (xa hoi)). hieu qua cac tuc va ((hanh ca) OR (hanh cat)) cau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((ma hoi) OR (xa hoi)). hieu qua cac tuc va ((hanh ca) or (hanh cat)) cau tren*".