Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
qua phat » qua nhat, qua phan, que phat
hoc van » hoc dan, hoc va, hoc vat
te sach » toc sach
sach ky » sac ky, sach y, sach ty
loc van » luoc van, lo van, loc va
mai hoi » mai khoi, dai hoi, lai hoi
le cau » le mau, le cap
ke cau » ket 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 mai hoi. hieu qua phat ((loc van) or (hoc van)) hanh ((le cau) OR (ke cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang mai hoi. hieu qua phat ((loc van) OR (hoc van)) hanh ((le cau) OR (ke cau)) tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang mai hoi. hieu qua phat ((loc van) or (hoc van)) hanh ((le cau) OR (ke cau)) tren*".