Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
cham tuc » nham thuc, tham thuc, cham soc
te sach » toc sach
cuu tre » cau tren, cau treo
hang vi » hang va, hanh vi, hang di
va hang » van hang, va nang, va lang
cua tre » cua te, cua triet, dua tren
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu qua ((cham tuc) or (pham thuc)) va hang vi ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu nang x hoi. hieu qua ((cham tuc) OR (pham thuc)) va hang vi ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu nang x hoi. hieu qua ((cham tuc) or (pham thuc)) va hang vi ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: te sach tu nang x hoi. hieu qua ((cham tuc) or (pham thuc)) va hang vi ((cuu tre) OR (cua tre))*.