Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
toc sach » hoc sach, doc sach, thuoc sach
qua cham » qua hai, qua cac, va cham
cham hoc » cham soc, chat hoc, cham hoi
va nang » van nang, da nang, cam nang
nang xa » nang x, lang xa, nang ma
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
tu te » tu tu, tu le

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (thuat sach)) va nang xa hoi. hieu qua cham hoc ((va danh) or (va hanh)) dien tu te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuat sach)) va nang xa hoi. hieu qua cham hoc ((va danh) OR (va hanh)) dien tu te.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thuat sach)) va nang xa hoi. hieu qua cham hoc ((va danh) or (va hanh)) dien tu te*.