Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
thai cua » than cua, tai cuc, tri cua
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
hai cua » dai cua, hoi cua, hai quan
lai cua » dai cua, lai chau
tu can » tu ban, tu cac, thu canh
can ky » van ky, dan ky, ban ky
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu can ky nang xa hoi. hieu ve cam thuc van hanh ((hai cua) or (((lai cua) OR (thai cua)))) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu can ky nang xa hoi. hieu ve cam thuc van hanh ((hai cua) OR (((lai cua) OR (thai cua)))) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu can ky nang xa hoi. hieu ve cam thuc van hanh ((hai cua) or (((lai cua) OR (thai cua)))) tre".
• Adding a wildcard symbol may retrieve word variants: tu can ky nang xa hoi. hieu ve cam thuc van hanh ((hai cua) or (((lai cua) OR (thai cua)))) tre*.