Perhaps you should try some spelling variations:
qua phat » qua nhat, qua phan, que phat
nang mai » nang ma, nang tai, lang mai
hanh le » thanh le, hanh ve, hanh de
hoc van » hoc dan, hoc va, hoc vat
loc van » luoc van, lo van, loc va
sach ky » sac ky, sach y, sach kem
mai hoi » mai khoi, dai hoi, lai hoi
sach ty » sach y, sach tu, sach thu
cuu tre » cua tre, cau tren, cau treo
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) OR (sach ty)) nang mai hoi. hieu qua 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) OR (sach ty)) nang mai hoi. hieu qua 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) OR (sach ty)) nang mai hoi. hieu qua phat ((loc van) or (hoc van)) hanh le cuu tre*".