Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thien van » thi van
va thanh » gia thanh, ban thanh, va tinh
thanh vi » hanh vi, thanh va, thanh ve
dua tren » dung tren
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
sach ky » sac ky, sach y, sach ty
van lam » van nam
lam duc » lam duoc, pham duc, nam duoc
tu sach » thu sach, su sach, te sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((nang xa) or (nang ma)) hoi. thien van lam duc va thanh vi ((dua tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang ma)) hoi. thien van lam duc va thanh vi ((dua tren) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (nang ma)) hoi. thien van lam duc va thanh vi ((dua tren) or (cua triet))*.