Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va trinh » van trinh, lap trinh, qua trinh
van cac » van hac, van cau, van bac
va tinh » may tinh
cac dat » cac dan, cai dat, cac dai
thu hai » thu ha, thu nhap, thu hang
nang ma » tang ma, sang ma, nang cao
thu tai » tu tai, tru tai, thuoc tai
vai cua » dai cua, hai cua, lai cua
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: ((thu hai) or (thu tai)) ky nang ma hoi. hieu van cac dat ((va trinh) or (va tinh)) vai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu hai) OR (thu tai)) ky nang ma hoi. hieu van cac dat ((va trinh) OR (va tinh)) vai cua vat.
• Adding a wildcard symbol may retrieve word variants: ((thu hai) or (thu tai)) ky nang ma hoi. hieu van cac dat ((va trinh) or (va tinh)) vai cua vat*.