Perhaps you should try some spelling variations:
kham tuc » nham thuc, pham thuc, kham cuoc
te sach » toc sach
cuu tre » cau tren, cau treo
dan dat » dung dat, dong dat, dinh dat
vu kham » vu khanh
hieu vu » hieu va, hieu ve, hieu su
cua tre » cua te, cua triet, dua tren
y nang » ky nang, ly nang, v nang
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau
ma hoi » mai hoi, ma hoa, me hoi

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 y nang ((ma hoi) or (xa hoi)). hieu vu kham tuc va dan dat ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((ma hoi) OR (xa hoi)). hieu vu kham tuc va dan dat ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((ma hoi) or (xa hoi)). hieu vu kham tuc va dan dat ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((ma hoi) or (xa hoi)). hieu vu kham tuc va dan dat ((cuu tre) OR (cua tre))*.