Perhaps you should try some spelling variations:
thuat sach » thuat san
thuat lanh » thuat lap, thuat san
tinh vai » tinh va, tinh hai, tinh bai
vai cua » dai cua, hai cua, lai cua
va tinh » may tinh
cham lo » cham o, cam lo, cham soc
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
ty tang » tay tang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
nam lo » nam bo, nam so, nam co

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 ma hoi. hieu ve ((cham lo) or (nam lo)) va tinh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (thuat lanh)) ty tang ma hoi. hieu ve ((cham lo) OR (nam lo)) va tinh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuat sach) OR (thuat lanh)) ty tang ma hoi. hieu ve ((cham lo) or (nam lo)) va tinh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) OR (thuat lanh)) ty tang ma hoi. hieu ve ((cham lo) or (nam lo)) va tinh vai cua tre*.