Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
hanh dai » hanh tai, hanh dao, vanh dai
cuu tre » cau tren, cau treo
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
cac dac » cac dan, cac dai, cac bac
van hoi » van hoa, van hoc, van hoe
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
cua tre » cua te, cua triet, dua tren
dac va » duc va, day va, dat va

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 dang)) van hoi. hieu va cac dac va hanh dai ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nganh ((ky lang) OR (ky dang)) van hoi. hieu va cac dac va hanh dai ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc nganh ((ky lang) or (ky dang)) van hoi. hieu va cac dac va hanh dai ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: hoc nganh ((ky lang) or (ky dang)) van hoi. hieu va cac dac va hanh dai ((cuu tre) OR (cua tre))*.