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, te sach, tu cach
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
y nang » ky nang, ly nang, v nang
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) OR (su sach)) y nang 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) OR (su sach)) y nang 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) OR (su sach)) y nang xa hoi. hieu van ((lam duoc) or (am thuc)) va danh vai cua su".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) y nang xa hoi. hieu van ((lam duoc) or (am thuc)) va danh vai cua su*.