Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
cau tren » cu tren, dau tren, ca tren
cham tuc » pham thuc, tham thuc, cham soc
hieu va » lieu va, hieu qua
nang xa » lang xa, nang ma, mang xa
va danh » va dinh, va dan, va hanh
danh ve » dinh ve, hanh ve, anh ve
sac ky » cac ky, sai ky
ve cau » ke cau, va cau, ve cac
tu sac » tu sach, tu cac, 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: tu sac ky ((nang xa) or (nang x)) hoi. hieu va ((cham tuc) OR (nham thuc)) va danh ve cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (nang x)) hoi. hieu va ((cham tuc) OR (nham thuc)) va danh ve cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang xa) or (nang x)) hoi. hieu va ((cham tuc) OR (nham thuc)) va danh ve cau tren".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) or (nang x)) hoi. hieu va ((cham tuc) OR (nham thuc)) va danh ve cau tren*.