Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, tu cach
cao tuc » dao tuc, cao duc, cao suc
hai cua » thai cua, dai cua, hoi cua
te sach » toc sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
tuc van » thuc van, truc van, tuc va
hieu va » lieu va, hieu qua
va cao » va cac, va co, va dao
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: ((tu sach) or (te sach)) ky ((nang xa) or (nang ma)) hoi. hieu va cao tuc van hanh hai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky ((nang xa) OR (nang ma)) hoi. hieu va cao tuc van hanh hai cua tu.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky ((nang xa) or (nang ma)) hoi. hieu va cao tuc van hanh hai cua tu*.