Perhaps you should try some spelling variations:
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
loc van » luoc van, lo van, loc va
hoc van » hoc dan, hoc va, hoc vat
hanh le » thanh le, hanh ve, hanh de
cuu tre » cua tre, cau tren, cau treo
sac ky » sai ky
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 ((sac ky) OR (cac ky)) nang ma hoa. 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 ((sac ky) OR (cac ky)) nang ma hoa. 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 ((sac ky) OR (cac ky)) nang ma hoa. hieu va phat ((loc van) or (hoc van)) hanh le cuu tre*".