Perhaps you should try some spelling variations:
tu thuoc » truc thuoc, tu thuong, cua thuoc
hanh vai » hanh va, hanh tai, hanh van
te sach » toc sach
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet

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 va ((tu thuoc) or (cau truc)) van ((hanh vai) OR (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang xa hoi. hieu va ((tu thuoc) OR (cau truc)) van ((hanh vai) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang xa hoi. hieu va ((tu thuoc) or (cau truc)) van ((hanh vai) OR (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang xa hoi. hieu va ((tu thuoc) or (cau truc)) van ((hanh vai) OR (hanh vi)) cua tre*.