Perhaps you should try some spelling variations:
hoa doanh » toan doanh, hoa dan
lam duoc » nam duoc, luat duoc, lam thuoc
vang cua » mang cua, hang cua, tang cua
hieu van » hieu va, thien van, lieu va
ma doanh » va doanh, van doanh, vay doanh
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
van lam » van nam
sac ky » cac ky, sai ky
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky ((nang ma) or (nang x)) hoi. hieu van lam duoc ((ma doanh) OR (hoa doanh)) vang cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((nang ma) OR (nang x)) hoi. hieu van lam duoc ((ma doanh) OR (hoa doanh)) vang cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky ((nang ma) or (nang x)) hoi. hieu van lam duoc ((ma doanh) OR (hoa doanh)) vang cua tre*".