Perhaps you should try some spelling variations:
thuat sach » thuat lanh
thuat san » thuat toan, thuat song, thuat lanh
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
tai cua » thai cua, tai cuc, tri cua
kham ly » khao ly, khanh ly
vu kham » vu khanh
hieu vu » hieu va, hieu ve, hieu su
cua tre » cua te, cuu tre, cua triet
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, ma hoa, me hoi
ly van » le van, ly va, ly von

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuat sach) OR (thuat san)) ty nang ((ma hoi) or (xa hoi)). hieu vu kham ly van hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (thuat san)) ty nang ((ma hoi) OR (xa hoi)). hieu vu kham ly van hanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuat sach) OR (thuat san)) ty nang ((ma hoi) or (xa hoi)). hieu vu kham ly van hanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) OR (thuat san)) ty nang ((ma hoi) or (xa hoi)). hieu vu kham ly van hanh tai cua tre*.