Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
van hanh » van thanh, ban hanh, van anh
cau tren » dau tren, ca tren, cau treo
cu tren » tu tren, dua tren
nang xa » nang x, lang xa, nang ma
sang ma » tang ma, nang ma, sang tao
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao

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 (sang ma)) hoi. hieu va cam duc van hanh thai ((cau tren) OR (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (sang ma)) hoi. hieu va cam duc van hanh thai ((cau tren) OR (cu tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang xa) or (sang ma)) hoi. hieu va cam duc van hanh thai ((cau tren) OR (cu tren))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) or (sang ma)) hoi. hieu va cam duc van hanh thai ((cau tren) OR (cu tren))*.