Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
trinh vi » trinh va, trinh ve, trinh viet
thu sai » thu hai, thu san, thu ai
thu tai » tu tai, tru tai, thu hai
nang ma » tang ma, sang ma, nang cao
van cac » van hac, van cau, van bac
cac dat » cac dan, cai dat, cac dai
dat lap » dan lap, dat lam, dat lai
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sai) or (thu tai)) ky nang ma hoi. hieu van cac dat lap trinh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sai) OR (thu tai)) ky nang ma hoi. hieu van cac dat lap trinh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: ((thu sai) or (thu tai)) ky nang ma hoi. hieu van cac dat lap trinh vi cua vat*.