Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
hanh tai » thanh tai, hang tai, han tai
nang tai » hang tai, tang tai, sang 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
tai hoi » tai khoi, dai hoi, tai hai
tu sach » su sach, te sach, tu cach
cua tre » cua te, cuu tre, cua triet
cam lo » nam lo, cam ly, cam o
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (tu sach)) y nang tai hoi. hieu qua ((cham lo) OR (cam lo)) va hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) y nang tai hoi. hieu qua ((cham lo) OR (cam lo)) va hanh tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (tu sach)) y nang tai hoi. hieu qua ((cham lo) OR (cam lo)) va hanh tai cua tre*".