Perhaps you should try some spelling variations:
thuat sac » thuat sach, thuat san, thuat tac
nang chat » nang cham, nang cao, nang suat
nang phat » nang suat, van phat
pham thuc » phap thuc, pham chuc, nham thuc
vat hang » van hang, dat hang, va hang
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
hang di » hang doi, hang vi, hang dien
sac ky » cac ky, sai ky
di cua » dai cua, doi cua, de cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sac ky ((nang chat) OR (nang phat)) hoc. hieu ve pham thuc vat hang di cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sac ky ((nang chat) OR (nang phat)) hoc. hieu ve pham thuc vat hang di cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sac ky ((nang chat) OR (nang phat)) hoc. hieu ve pham thuc vat hang di cua te*.