Perhaps you should try some spelling variations:
phap trinh » phap tinh, phap sinh, phap dinh
hieu van » hieu va, thien van, lieu va
thu san » thuy san, thu ban, phu san
lam hoc » am hoc, lam hoa, tam hoc
van lam » van nam
lang ha » long ha
ca viet » va viet, co viet, hoa viet
san ky » sang ky, van ky, dan ky
vat ca » vat cua, vat va, vat co

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu san ky ((lang ha) or (nang x)) hoi. hieu van lam hoc ((phap trinh) or (lap trinh)) vat ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu san ky ((lang ha) OR (nang x)) hoi. hieu van lam hoc ((phap trinh) OR (lap trinh)) vat ca viet.
• Adding a wildcard symbol may retrieve word variants: thu san ky ((lang ha) or (nang x)) hoi. hieu van lam hoc ((phap trinh) or (lap trinh)) vat ca viet*.