Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
phan duc » pham duc, phan tu, phan dau
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, nang ma
hieu vi » hieu voi, hieu va, hieu ve
vi phan » va phan, vi pham, ve phan
duc van » duc va, duc tan, duc manh
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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) or (((toc sach) OR (doc sach)))) ky nang xa hoi. hieu vi phan duc van hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (((toc sach) OR (doc sach)))) ky nang xa hoi. hieu vi phan duc van hanh vi cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (((toc sach) OR (doc sach)))) ky nang xa hoi. hieu vi phan duc van hanh vi cuu tre*".