Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
dang xay » dang van, van xay
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
sach ty » sach y, sach tu, sach thu
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((nang ma) or (dang xay)) hoi. hieu va cam tuc va hanh vi ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang ma) OR (dang xay)) hoi. hieu va cam tuc va hanh vi ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang ma) or (dang xay)) hoi. hieu va cam tuc va hanh vi ((cua tre) or (su triet))*.