Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
cuu thuc » cuu tac
tu sach » thu sach, te sach, tu cach
van cuu » van cau, van chu, van cu
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
te cua » tue cua, de cua
le cua » ly cua

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) or (su sach)) ky nang xa hoi. hieu van cuu thuc dan hanh ((te cua) OR (le cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. hieu van cuu thuc dan hanh ((te cua) OR (le cua)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang xa hoi. hieu van cuu thuc dan hanh ((te cua) OR (le cua)) tu".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang xa hoi. hieu van cuu thuc dan hanh ((te cua) OR (le cua)) tu*.