Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
vat hanh » vat thanh, va hanh, nhat hanh
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
cuu tac » cuu dac, cuu cac, cuu xac
tue cua » te cua
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: tu sach ty nang xa hoi. hieu van ((cuu thuc) or (cuu tac)) ((vat hanh) OR (van hanh)) tue cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu van ((cuu thuc) OR (cuu tac)) ((vat hanh) OR (van hanh)) tue cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. hieu van ((cuu thuc) or (cuu tac)) ((vat hanh) OR (van hanh)) tue cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu van ((cuu thuc) or (cuu tac)) ((vat hanh) OR (van hanh)) tue cua te*.