Perhaps you should try some spelling variations:
nang can » nang cao, nang ban, nang cai
phan cam » phan cac, phan cau, khoan cam
nang cap » nang cao, nang cham, nang phap
va hanh » van hanh, va thanh, va danh
phan ca » phan cac, phan cau, phan ba
vu hanh » vu khanh, vu thanh, du hanh
hanh ky » hanh kem
cao loc » cao hoc, cao toc, cao oc
loc va » hoc va, luc va
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu hanh ky ((nang can) or (nang cap)) hoi. lieu va cao loc va hanh ((phan ca) or (phan cam)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu hanh ky ((nang can) OR (nang cap)) hoi. lieu va cao loc va hanh ((phan ca) OR (phan cam)) viet.
• Adding a wildcard symbol may retrieve word variants: vu hanh ky ((nang can) or (nang cap)) hoi. lieu va cao loc va hanh ((phan ca) or (phan cam)) viet*.