Perhaps you should try some spelling variations:
thai thuc » thai thuy, thai tuc, thi thuc
tham thuc » nham thuc, tam thuc, thach thuc
pham thuc » phap thuc, pham chuc, nham thuc
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
va hang » van hang, va nang, va lang
hang vi » hang va, hanh vi, hang di
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 hoi. hieu qua ((((tham thuc) OR (thai 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 hoi. hieu qua ((((tham thuc) OR (thai 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 hoi. hieu qua ((((tham thuc) OR (thai thuc))) or (pham thuc)) va hang vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach tu nang xa hoi. hieu qua ((((tham thuc) OR (thai thuc))) or (pham thuc)) va hang vi cuu tre*.