Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
hanh hai » thanh hai, nhanh hai, hang hai
hieu va » lieu va, hieu qua
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
cac duc » cac du, cao duc, cac dac
hieu ve » hieu van
van hoi » van hoa, van hoc, van hoe
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
cua te » cua tu

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