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, te sach, tu cach
hai cuc » tai cuc, hai cua, thai cua
thuc va » thuc vat, thuc dan, thuc day
van cam » van nam, van lam, van cau
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
cuc tre » duc tre, cua tre, cuu tre
tuc va » truc va, tuc xa, duc va

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 (su sach)) ky nang xa hoi. hieu van cam ((tuc va) OR (thuc va)) hanh hai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. hieu van cam ((tuc va) OR (thuc va)) hanh hai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang xa hoi. hieu van cam ((tuc va) OR (thuc va)) hanh hai cuc tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang xa hoi. hieu van cam ((tuc va) OR (thuc va)) hanh hai cuc tre*.