Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
toan va » doan va, tran van, toan ban
va tinh » may tinh
nang xa » lang xa, nang ma, mang xa
cam thu » nam thu, cac thu, ca thu
hieu ve » hieu va, hieu van
thu va » thuc va, thue va, tu va
ve cam » ve cham, ve cac, va cam
te sac » te sach, te cac
te san » te ban, ke san, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sac) OR (te san)) ky ((nang xa) or (nang x)) hoi. hieu ve cam thu va tinh toan va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te san)) ky ((nang xa) OR (nang x)) hoi. hieu ve cam thu va tinh toan va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) OR (te san)) ky ((nang xa) or (nang x)) hoi. hieu ve cam thu va tinh toan va trien".
• Adding a wildcard symbol may retrieve word variants: ((te sac) OR (te san)) ky ((nang xa) or (nang x)) hoi. hieu ve cam thu va tinh toan va trien*.