Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hanh thai » nhanh thai, hinh thai, hanh tai
nam thuc » nam thuoc, am thuc, nam thu
thai cua » than cua, tai cuc, tri cua
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
nam tuc » nam truc, nam tu, nam thuoc
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
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: ((thuoc sach) or (dac sac)) ky nang ma hoi. hieu van ((nam tuc) or (nam thuc)) va hanh thai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (dac sac)) ky nang ma hoi. hieu van ((nam tuc) OR (nam thuc)) va hanh thai cua te.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (dac sac)) ky nang ma hoi. hieu van ((nam tuc) or (nam thuc)) va hanh thai cua te*.