Perhaps you should try some spelling variations:
lam duoc » nam duoc, luat duoc, lam thuoc
danh vai » danh sai, danh va, doanh van
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y ((nang xa) OR (lang xa)) hoi. hieu van ((lam duoc) or (am thuc)) va danh vai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang xa) OR (lang xa)) hoi. hieu van ((lam duoc) OR (am thuc)) va danh vai cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang xa) OR (lang xa)) hoi. hieu van ((lam duoc) or (am thuc)) va danh vai cua su".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) OR (lang xa)) hoi. hieu van ((lam duoc) or (am thuc)) va danh vai cua su*.