Perhaps you should try some spelling variations:
hoc nhanh » hoc nganh, hoc phan
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cac dac » cac dan, cac dai, cac bac
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
van hoi » van hoa, van hoc, van hoe
dac va » duc va, day va, dat va
_ lang » o lang, _ land
y lang » o lang, tay lang, yen lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc nhanh ((y lang) or (_ lang)) van hoi. ((hieu ve) or (hieu va)) cac dac va hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nhanh ((y lang) OR (_ lang)) van hoi. ((hieu ve) OR (hieu va)) cac dac va hanh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc nhanh ((y lang) or (_ lang)) van hoi. ((hieu ve) or (hieu va)) cac dac va hanh thai cua tre*.