Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hien bach » vien bach, thien hach, hien hanh
bach tuoc » sach duoc, sach nuoc
cau treo » cau tren, cau triet, cau trieu
cau theo » cau thi, cau tao
tuoc va » thuoc va, nuoc va, duoc va
va hang » van hang, va nang, va lang
tu sai » tu bai, tu san, tu lai
tu cai » tu cac, tu can, tu bai

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) or (tu cai)) ky nang x ho. hieu hien bach tuoc va hang va ((cau treo) OR (cau theo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sai) OR (tu cai)) ky nang x ho. hieu hien bach tuoc va hang va ((cau treo) OR (cau theo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sai) or (tu cai)) ky nang x ho. hieu hien bach tuoc va hang va ((cau treo) OR (cau theo))".
• Adding a wildcard symbol may retrieve word variants: ((tu sai) or (tu cai)) ky nang x ho. hieu hien bach tuoc va hang va ((cau treo) OR (cau theo))*.