Perhaps you should try some spelling variations:
tham thuc » nham thuc, tam thuc, thai thuc
pham thuc » phap thuc, pham chuc, nham thuc
hang vi » hang va, hanh vi, hang di
va hang » van hang, va nang, va lang
sach tu » sach thu, cach tu, sach ty
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
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 tu ((nang xa) OR (nang ma)) hoi. hieu qua ((tham thuc) or (pham thuc)) va hang vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu ((nang xa) OR (nang ma)) hoi. hieu qua ((tham thuc) OR (pham thuc)) va hang vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu ((nang xa) OR (nang ma)) hoi. hieu qua ((tham thuc) or (pham thuc)) va hang vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach tu ((nang xa) OR (nang ma)) hoi. hieu qua ((tham thuc) or (pham thuc)) va hang vi cuu tre*.