Perhaps you should try some spelling variations:
chat luoc » chat luong, chat hoc, chat xuc
dinh chi » dinh thi, dinh tri, dinh moi
van hanh » van thanh, ban hanh, van anh
luoc van » luoc can, luoc va, luc van
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
ky dung » ly dung, ky dang, ky vung
sai ky » sac ky
ha hoi » hoa hoi, ha noi, xa hoi
tu sai » tu bai, tu san, tu cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky dung ((ha hoi) or (hoa hoc)). hieu va chat luoc van hanh ((dinh cuu) OR (dinh chi)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky dung ((ha hoi) OR (hoa hoc)). hieu va chat luoc van hanh ((dinh cuu) OR (dinh chi)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky dung ((ha hoi) or (hoa hoc)). hieu va chat luoc van hanh ((dinh cuu) OR (dinh chi)) tre*".