Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
nganh ky » nganh y, nganh xay, hanh ky
hang hoi » hang hoa, hang hai, hang doi
van hieu » cao hieu
cua tre » cua te, cua triet, dua tren
va hang » van hang, va nang, va lang
cuu tre » cau tren, cau treo
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
van hoe » van hoa, van hoc, van hien
ky lang » ky nang, ky dang, ky tang
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: hoc nganh ky lang ((van hoe) OR (van hieu)). hieu ve cac duc va hang hoi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nganh ky lang ((van hoe) OR (van hieu)). hieu ve cac duc va hang hoi ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc nganh ky lang ((van hoe) OR (van hieu)). hieu ve cac duc va hang hoi ((cua tre) or (cuu tre))*".