Perhaps you should try some spelling variations:
cach hoc » cach thuc, cach thoi, dich hoc
hanh dai » hanh tai, hanh dao, vanh dai
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va cach » va cac
va hanh » van hanh, va thanh, va danh
te sac » te sach, te san
te cac » tu cac, ve cac, te cao
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: ((te sac) or (te cac)) ky ((nang x) or (lang xa)) hoi. hieu va cach hoc va hanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te cac)) ky ((nang x) OR (lang xa)) hoi. hieu va cach hoc va hanh dai cua te.
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (te cac)) ky ((nang x) or (lang xa)) hoi. hieu va cach hoc va hanh dai cua te*.