Perhaps you should try some spelling variations:
thuat sac » thuat sach, thuat san, thuat tac
nang chat » nang phat, nang cao, nang suat
nang cham » trang cham, nang cao, nang phat
pham thuc » phap thuc, pham chuc, nham thuc
thuc day » thuc dan, thuc vat
day hang » dat hang, dai hang, day nang
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
hang vi » hang va, hanh vi, hang di
sac ky » cac ky, sai ky
vi cua » vai cua, di 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 cham)) hoc. hieu ve pham thuc day hang vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sac ky ((nang chat) OR (nang cham)) hoc. hieu ve pham thuc day hang vi cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sac ky ((nang chat) OR (nang cham)) hoc. hieu ve pham thuc day hang vi cua te*.