Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
ve triet » va trien, su triet
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
thuc va » thuc vat, thuc day
dinh ke » dinh ket, dinh ve, dinh le
va cam » va cham, va cac, va cao
tuc va » truc va, tuc xa, duc va
ke ve » ke va, ke he, de ve

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 ky tang xa hoi. lieu va cam ((tuc va) or (((thuc va) OR (thuc dan)))) dinh ke ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky tang xa hoi. lieu va cam ((tuc va) OR (((thuc va) OR (thuc dan)))) dinh ke ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky tang xa hoi. lieu va cam ((tuc va) or (((thuc va) OR (thuc dan)))) dinh ke ve triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky tang xa hoi. lieu va cam ((tuc va) or (((thuc va) OR (thuc dan)))) dinh ke ve triet*.