Perhaps you should try some spelling variations:
tan khang » van khang, tao khang, tinh khang
tan hang » ban hang, van hang, gan hang
cua tre » cua te, cuu tre, cua triet
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
tang xa » trang xa, tang ma, tang ha
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
su sac » su sach, su cac, su xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((tang xa) or (lang xa)) hoi. hieu va cam duc ((tan hang) OR (tan khang)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((tang xa) OR (lang xa)) hoi. hieu va cam duc ((tan hang) OR (tan khang)) dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky ((tang xa) or (lang xa)) hoi. hieu va cam duc ((tan hang) OR (tan khang)) dai cua tre*".