Perhaps you should try some spelling variations:
hoc nhanh » hoc nganh, hoc phan
hanh dai » hanh tai, hanh dao, vanh dai
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
van hoe » van hoa, van hieu, van hien
van hoc » van hoa
hieu va » lieu va, hieu qua
cac dac » cac dan, cac dai, cac bac
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
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 nhanh ((ky lang) or (ky dang)) ((van hoe) OR (van hoc)). hieu va cac dac va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nhanh ((ky lang) OR (ky dang)) ((van hoe) OR (van hoc)). hieu va cac dac va hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc nhanh ((ky lang) or (ky dang)) ((van hoe) OR (van hoc)). hieu va cac dac va hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc nhanh ((ky lang) or (ky dang)) ((van hoe) OR (van hoc)). hieu va cac dac va hanh dai cua tre*.