Perhaps you should try some spelling variations:
cuu thuoc » cua thuoc, cuu thuc, cay thuoc
hieu van » thien van, lieu va, hieu ve
dan hanh » dang hanh, dan khanh, dan thanh
tu sach » thu sach, su sach, te sach
hanh te » hanh tu, hanh ve, hanh de
cuu hoc » cua hoc, cuu khoa, cuu duoc
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
te cua » tue cua, le cua, de 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 ky nang xa hoi. ((hieu van) OR (hieu va)) ((cuu hoc) or (cuu thuoc)) dan hanh te cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. ((hieu van) OR (hieu va)) ((cuu hoc) OR (cuu thuoc)) dan hanh te cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. ((hieu van) OR (hieu va)) ((cuu hoc) or (cuu thuoc)) dan hanh te cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. ((hieu van) OR (hieu va)) ((cuu hoc) or (cuu thuoc)) dan hanh te cua te*.