Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cau triet » cau trieu, su triet, va triet
danh hai » dang hai, lanh hai, manh hai
truc va » thuc va, thuc vat, trung va
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
va lam » van lam, va lap
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, tuc xa, duc va

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 ly nang ma hoi. hieu va lam ((tuc va) or (truc va)) danh hai ((cau triet) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang ma hoi. hieu va lam ((tuc va) OR (truc va)) danh hai ((cau triet) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly nang ma hoi. hieu va lam ((tuc va) or (truc va)) danh hai ((cau triet) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ly nang ma hoi. hieu va lam ((tuc va) or (truc va)) danh hai ((cau triet) OR (cua triet))*.