Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cau tuc » cau truc, cau tu, cau luc
xa tinh » va tinh, ha tinh, ca tinh
tinh di » tinh doi, trinh di, tinh da
cua tre » cua te, cuu tre, cua triet

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 x ho. ((hieu van) or (hieu qua)) cau tuc xa tinh di ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang x ho. ((hieu van) OR (hieu qua)) cau tuc xa tinh di ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: su sach ty nang x ho. ((hieu van) or (hieu qua)) cau tuc xa tinh di ((cua tre) or (su triet))*.