Perhaps you should try some spelling variations:
trinh tai » trinh toan, trinh tu, trinh han
hieu van » hieu va, thien van, lieu va
tinh tai » tinh thai, tinh hai, hinh tai
cam tuc » cam xuc, cam tu, nam thuc
van cam » van nam, van lam, van cau
sach ky » sach y, sach ty, sach kem
tang ma » mang may, tang van
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa
sac ky » cac ky, sai ky
cua te » cua tu

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) or (sac ky)) tang ma hoi. hieu van cam tuc va ((tinh tai) OR (trinh tai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) tang ma hoi. hieu van cam tuc va ((tinh tai) OR (trinh tai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) tang ma hoi. hieu van cam tuc va ((tinh tai) OR (trinh tai)) cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) tang ma hoi. hieu van cam tuc va ((tinh tai) OR (trinh tai)) cua te*.