Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
toc sach » hoc sach, doc sach, thuoc sach
dung sai » dung tai, dung va, dung dat
vat dung » van dung, va dung, viet dung
van nham » van nam, van nhan, van tham
hieu van » hieu va, thien van, lieu va
sai cua » dai cua, hai cua, lai cua
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
hoc anh » hoc nganh, hoc nhanh, ngoc anh
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: ((toc sach) or (hoc anh)) ((ky lang) or (ky dang)) xa hoi. hieu van nham thuc vat dung sai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc anh)) ((ky lang) OR (ky dang)) xa hoi. hieu van nham thuc vat dung sai cua te.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc anh)) ((ky lang) or (ky dang)) xa hoi. hieu van nham thuc vat dung sai cua te*.