Perhaps you should try some spelling variations:
trinh vi » trinh va, trinh ve, trinh viet
va trinh » van trinh, va tinh, lap trinh
cua tre » cua te, cuu tre, cua triet
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
hieu va » hieu qua
vi cua » vai cua, di cua
cam ly » tam ly, cam ky, cam lo
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky sang ma hoi. ((hieu va) or (lieu va)) ((cam lyc) or (cam ly)) va trinh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky sang ma hoi. ((hieu va) OR (lieu va)) ((cam lyc) OR (cam ly)) va trinh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky sang ma hoi. ((hieu va) or (lieu va)) ((cam lyc) or (cam ly)) va trinh vi cua tre*.