Perhaps you should try some spelling variations:
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
cam thuc » am thuc, nam thuc, cam thu
doi cua » dai cua, hoi cua, dong cua
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
ve cam » ve cham, ve cac, va cam
su xac » pu xac, su cac
vi cua » vai cua, di cua
su sac » su sach, su cac

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su xac)) ky lang xa hoi. hieu ve cam thuc dan hanh ((vi cua) OR (doi cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) OR (su xac)) ky lang xa hoi. hieu ve cam thuc dan hanh ((vi cua) or (doi cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sac) OR (su xac)) ky lang xa hoi. hieu ve cam thuc dan hanh ((vi cua) or (doi cua)) tre*.