Perhaps you should try some spelling variations:
va doanh » van doanh, vay doanh, hoa doanh
tang cua » mang cua, hang cua, tang luan
toc sac » toc sach, toc san, hoc sach
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
cac tuc » cac toc, cac tac, cac nuoc
hieu ve » hieu va, hieu van
dang ha » dong ha, dung ha, lang ha
ky dang » ky nang, ky danh
sac ky » cac ky, sai ky
cac tu » cac thu, cach tu, cac du
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sac ky dang ha hoi. hieu ve ((cac tuc) or (cac tu)) ((va doanh) OR (va danh)) tang cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky dang ha hoi. hieu ve ((cac tuc) OR (cac tu)) ((va doanh) OR (va danh)) tang cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sac ky dang ha hoi. hieu ve ((cac tuc) or (cac tu)) ((va doanh) OR (va danh)) tang cua tre*".