Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
cach tu » cach thuc
loai ve » loai va, hoai ve, loai viet
xa hanh » xa thanh, xa khanh, va hanh
bo sach » co sach, hoc sach
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
cac tu » cac thu, cac du, tac tu
ma hoi » mai hoi, xa hoi, ma hoa
lai ve » lai va, la ve, lai de

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ty nang ma hoi. hieu vien ((cac tu) or (cach tu)) xa hanh ((lai ve) OR (loai ve)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ty nang ma hoi. hieu vien ((cac tu) OR (cach tu)) xa hanh ((lai ve) OR (loai ve)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ty nang ma hoi. hieu vien ((cac tu) or (cach tu)) xa hanh ((lai ve) OR (loai ve)) triet".
• Adding a wildcard symbol may retrieve word variants: bo sach ty nang ma hoi. hieu vien ((cac tu) or (cach tu)) xa hanh ((lai ve) OR (loai ve)) triet*.