Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
va tinh » may tinh
va hanh » van hanh, va thanh, va danh
cac xuc » cam xuc, cac nuoc, chat xuc
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
su sach » so sach, vu sach
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
hai su » hai vu, lai su, hai so
ve cac » va cac, vien cac

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 ky ((sang ma) or (nang ma)) hoi. hieu ve cac xuc ((va hanh) or (va tinh)) hai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((sang ma) OR (nang ma)) hoi. hieu ve cac xuc ((va hanh) OR (va tinh)) hai su triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((sang ma) or (nang ma)) hoi. hieu ve cac xuc ((va hanh) or (va tinh)) hai su triet*.