Perhaps you should try some spelling variations:
vang cua » mang cua, hang cua, tang cua
va doanh » van doanh, vay doanh, hoa doanh
toc sai » toc san, toc dai, thuoc sai
va danh » va dinh, va dan, va hanh
cac tac » cac toc, cac bac, cac dac
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
dung ha » dung va, dung he, dung khoa
dang ha » dong ha, lang ha, tang ha
sai ky » sac ky
ve cac » va cac, vien cac

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

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