Perhaps you should try some spelling variations:
nam duoc » nam thuoc, da duoc, dat duoc
van hanh » van thanh, ban hanh, van anh
hanh hai » thanh hai, nhanh hai, hang hai
tu sach » thu sach, su sach, te sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cao duc » dao duc, cao suc, giao duc
hai cua » thai cua, dai cua, hoi cua
cua te » cua tu

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 ly nang xa hoi. hieu va ((nam duoc) or (cao duc)) van hanh hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly nang xa hoi. hieu va ((nam duoc) OR (cao duc)) van hanh hai cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach ly nang xa hoi. hieu va ((nam duoc) or (cao duc)) van hanh hai cua te*.