Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh tai » thanh tai, hang tai, han tai
dang bai » dung bai, dang hai, dang ba
bai hoi » bai choi, bai hoc, dai hoi
hieu va » lieu va
sach ky » sac ky, sach y, sach ty
cham lo » cham o, cam lo, cham hoi
va hanh » van hanh, va thanh, va danh
ky dang » ky nang, ky danh
tai cua » thai cua, tai cuc, tri 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: thuat sach ky dang bai hoi. ((hieu va) or (hieu qua)) ((cham lo) OR (cham soc)) va hanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky dang bai hoi. ((hieu va) OR (hieu qua)) ((cham lo) OR (cham soc)) va hanh tai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky dang bai hoi. ((hieu va) or (hieu qua)) ((cham lo) OR (cham soc)) va hanh tai cua te*".