Perhaps you should try some spelling variations:
te sach » toc sach
hanh le » thanh le, hanh ve, hanh de
hoc van » hoc dan, hoc va, hoc vat
loc van » luoc van, lo van, loc va
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
cuu tre » cua tre, cau tren, cau treo
ma hoi » xa hoi, ma hoa, me hoi
le cuu » le cua, le huu, le cau

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 ky nang ((ma hoi) OR (mai hoi)). hieu va phat ((loc van) or (hoc van)) hanh le cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((ma hoi) OR (mai hoi)). hieu va phat ((loc van) OR (hoc van)) hanh le cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((ma hoi) OR (mai hoi)). hieu va phat ((loc van) or (hoc van)) hanh le cuu tre*".