Perhaps you should try some spelling variations:
nang thai » nang tai, dang thai, lang thai
thai cuu » thai cua, tai cuc, thi cuc
tu sach » thu sach, te sach, tu cach
thue va » thuc va, thuyet va, thuat va
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
su sach » so sach, vu sach
y lang » o lang, _ lang, tay lang
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 sach) OR (su sach)) y lang xa hoi. hieu va cam ((thue va) or (thuc vat)) nang thai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) y lang xa hoi. hieu va cam ((thue va) OR (thuc vat)) nang thai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) y lang xa hoi. hieu va cam ((thue va) or (thuc vat)) nang thai cuu tre*".