Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
hanh day » hanh may, hanh dao, thanh dat
te sach » toc sach
han day » phan day, han dau, dan day
cam tuc » cam xuc, cam tu, nam thuc
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang xa hoi. ((hieu van) or (thien van)) cam tuc va ((hanh day) OR (han day)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang xa hoi. ((hieu van) OR (thien van)) cam tuc va ((hanh day) OR (han day)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang xa hoi. ((hieu van) or (thien van)) cam tuc va ((hanh day) OR (han day)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang xa hoi. ((hieu van) or (thien van)) cam tuc va ((hanh day) OR (han day)) cua tre*.