Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh hai » thanh hai, nhanh hai, hang hai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van cau
truc va » thuc va, thuc vat, trung va
luc va » duc va, tuc va, loc va
cua cu » cua chu, cua cau, cua co
cua su » qua su

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 ky nang x ho. hieu van cam ((truc va) or (luc va)) hanh hai ((cua cu) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x ho. hieu van cam ((truc va) OR (luc va)) hanh hai ((cua cu) OR (cua su)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x ho. hieu van cam ((truc va) or (luc va)) hanh hai ((cua cu) or (cua su))*.