Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
cua triet » cua viet, su triet, va triet
hanh hai » thanh hai, nhanh hai, hang hai
dua tren » dung tren
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
van hoi » van hoa, van hoc, van hoe
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
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) OR (ky tang)) van hoi. hieu ve cac duc va hanh hai ((dua tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nganh ((ky lang) OR (ky tang)) van hoi. hieu ve cac duc va hanh hai ((dua tren) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc nganh ((ky lang) OR (ky tang)) van hoi. hieu ve cac duc va hanh hai ((dua tren) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: hoc nganh ((ky lang) OR (ky tang)) van hoi. hieu ve cac duc va hanh hai ((dua tren) or (cua triet))*.