Perhaps you should try some spelling variations:
thuat sach » thuat san
thuat lanh » thuat lap, thuat san
hanh tai » thanh tai, hang tai, han tai
tai cua » thai cua, tai cuc, tri cua
va hanh » van hanh, va thanh, va danh
cham lo » cham o, cham soc, cham hoi
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
ty tang » tay tang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
cam lo » nam lo, cam ly, cam o

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 lanh)) ty tang xa hoi. hieu ve ((cham lo) or (cam lo)) va hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (thuat lanh)) ty tang xa hoi. hieu ve ((cham lo) OR (cam lo)) va hanh tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuat sach) OR (thuat lanh)) ty tang xa hoi. hieu ve ((cham lo) or (cam lo)) va hanh tai cua tre*".