Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vu sach » vu bach, su sach, vu khach
va hanh » van hanh, va thanh, va danh
cau tuc » cau truc, cau tu, cau luc
sach ty » sach y, sach tu, sach thu
hieu ke » hieu kem, chieu ke, hieu ky
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
ca viet » va viet, co viet, hoa viet
ke cau » ket cau
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: vu sach ty ((tang ma) or (nang ma)) hoi. hieu ke cau tuc va hanh vi ((cua triet) or (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty ((tang ma) OR (nang ma)) hoi. hieu ke cau tuc va hanh vi ((cua triet) OR (ca viet)).
• Adding a wildcard symbol may retrieve word variants: vu sach ty ((tang ma) or (nang ma)) hoi. hieu ke cau tuc va hanh vi ((cua triet) or (ca viet))*.