Perhaps you should try some spelling variations:
nang doc » nang luc
va doanh » van doanh, vay doanh, hoa doanh
hieu van » hieu va, thien van, lieu va
doc loi » duc loi
sach ty » sach y, sach tu, sach thu
sach ky » sac ky, sach y, sach kem
van lam » van nam
lam xuc » cam xuc, lam duoc
va danh » va dinh, va dan, va hanh
cuc te » cua te, cuc thue, cuc tieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) or (sach ty)) nang doc loi. hieu van lam xuc ((va doanh) OR (va danh)) tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach ty)) nang doc loi. hieu van lam xuc ((va doanh) OR (va danh)) tai cuc te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) or (sach ty)) nang doc loi. hieu van lam xuc ((va doanh) OR (va danh)) tai cuc te".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sach ty)) nang doc loi. hieu van lam xuc ((va doanh) OR (va danh)) tai cuc te*.