Perhaps you should try some spelling variations:
te sach » toc sach
ty nang » ty xang, ty hang, ly nang
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
dan lai » dan loai, dan lap, dan lat
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
va dan » ca dan, va dao, va dau
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 ((ty nang) or (ky nang)) x hoi. hieu va pham duc va dan lai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty nang) OR (ky nang)) x hoi. hieu va pham duc va dan lai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty nang) or (ky nang)) x hoi. hieu va pham duc va dan lai ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty nang) or (ky nang)) x hoi. hieu va pham duc va dan lai ((cua tre) OR (cuu tre))*.