Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
lam duoc » nam duoc, luat duoc, lam thuoc
te sach » toc sach
ky dang » ky danh
van lam » van nam
duoc ma » duoc lam
ma danh » va danh, ma dan, mo danh
vai cua » hai cua, lai cua, bai cua

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

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