Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
tu sach » thu sach, su sach, te sach
hai cua » thai cua, dai cua, hoi cua
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
xac va » tac va, ac va, bac va
luc va » duc va, tuc va, loc va
nang o » nang co, nang ho, nang ro
cua tu » cua tuc, cua su, cua cu
o lai » o lao

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) or (thu hoach)) ky nang o lai. hieu va cam ((xac va) or (luc va)) hanh hai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ky nang o lai. hieu va cam ((xac va) OR (luc va)) hanh hai cua tu.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) ky nang o lai. hieu va cam ((xac va) or (luc va)) hanh hai cua tu*.